* {
    margin: 0px;
    padding: 0px;
}

a {
    text-decoration: none;
    color: black;
}

#border {
    margin-top: 100px;
    margin-left: 100px;
    width: 498px;
    height: 120px;
    border: 1px solid #cccccc;
    overflow: hidden;
}

#tab {
    position: relative;
}

#tab-list {
    width: 500px;
    height: 36px;;
    background: #f7f7f7;
    list-style: none;
    position: absolute;
    left: -1px;
}

#tab-list li {
    box-sizing: border-box;
    float: left;
    width: 100px;
    background-color: rgba(0, 0, 0, 0);
    text-align: center;
    height: 36px;
    line-height: 36px;
    border-bottom: 1px solid #cccccc;
    border-left: 0px;
    border-right: 0px;
}

#tab-list li.current-tab {
    background-color: white;
    border-bottom: 0;
    border-left: 1px solid #cccccc;
    border-right: 1px solid #cccccc;
}

#content {
    margin-top: 36px;
    height: 64px;
}

#content .dom {
    display: none;
    height: 64px;
}

.content-list {
    height: 64px;
}

.content-list li {
    list-style: none;
    float: left;
    display: inline-block;
    width: 230px;
    margin: 8px;
    padding-left: 8px;
    box-sizing: border-box;
}